Philips 42PFL3704D/F7 - Page 41

8-6 A91H2TR
[ Audio Signal Section ]
Check SP801,SP802 and their periphery circuit,
and service it if defective.
Are the audio(L/R) signals inputted to Pin(1, 44)
of IC801?
Ye s
Ye s
No
Are the audio(L/R) signals outputted to CN801 and
CN802?
Check IC801 and their periphery circuit, and
service it if defective.
No
Ye s
Ye s
Ye s
Ye s
Check the line between Pin(8, 10) of CN202 and
Pin(1, 44) of IC801, and service it if defective.
Replace Digital Main CBA Unit or LCD Module
Assembly.
Is 5V voltage supplied to the Pin(2, 29, 33, 39, 44) of IC401?
Is 8.2V voltage supplied to the Pin(12) of IC401?
Replace IC401.
Check P-ON+5V, P-ON+8.2V line
and service it if defective.
Ye s
No
Ye s
(Output to speakers)
Yes
(Output to audio
output terminal)
FLOW CHART NO.1
Picture does not appear normally. (EXT. input)
Are the audio(L/R) signals inputted to each pin of
IC401?
Check the line between audio input terminal and
each pin of IC401.
Are the audio(L/R) signals outputted to Pin(27, 28) of
IC401?
Are the audio(L/R) signals outputted to Pin(8, 10) of
CN202?
Ye s
No
No
No
No
Replace Digital Main CBA Unit or LCD Module
Assembly.
Are the audio(L/R) signals outputted to Pin(4, 6) of
CN202?
No
IC401 AUDIO(L/R)-IN 1
AUDIO(L/R)-IN 2
COMPONENT AUDIO(L/R)-IN
HDMI AUDIO(L/R)-IN
AUDIO(L/R)-IN 1
AUDIO(L/R)-IN 2
COMPONENT AUDIO(L/R)-IN
HDMI AUDIO(L/R)-IN
14,15PIN
IC401 16,17PIN
IC401 20,21PIN
IC401 24,25PIN
14,15PIN
16,17PIN
20,21PIN
24,25PIN
IC401
IC401
IC401
IC401
→ JK704, JK705
→ JK708, JK709
→ JK712, JK713
→ JK720, JK721
Are the audio(L/R) signals inputted to Pin(3, 5)
of IC803?
Check the line between Pin(4, 6) of CN202 and
Pin(3, 5) of IC803, and service it if defective.
No
Are the audio(L/R) signals outputted to Pin(1, 7)
of IC803?
Check the line between Pin(1, 7) of IC803 and audio
output terminal(JK722, JK723) and service it if defective.
Replace IC803